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Gases
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Bio-Energy: Biogas, Biomethane and Green-Hydrogen
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Bio-Energy: Biogas, Biomethane and Green-Hydrogen

A special issue of Gases (ISSN 2673-5628).

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1526

Special Issue Editor

Prof. Dr. João Fernando Pereira Gomes

E-Mail Website
Guest Editor
Department of Chemical Engineering (ADEQ), Instituto Superior de Engenharia de Lisboa (ISEL), R. Conselheiro Emídio Navarro, 1959-007 Lisboa, Portugal
Interests: air pollution abatement; air pollution monitoring and control; particulate pollutants; indoor air pollution; combustion; clean fuels
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Bio-energy, derived from organic materials such as agricultural residues, organic waste, and dedicated energy crops, plays a crucial role in transitioning to a sustainable and low-carbon energy future. Biogas, biomethane, and green hydrogen are key components of bio-energy that hold significant promise in meeting energy demands while reducing greenhouse gas emissions.

Biogas, produced through the anaerobic digestion of organic matter, comprises primarily methane (CH4) and carbon dioxide (CO2). It can be utilised for electricity generation, heating, and as a vehicle fuel, offering a versatile and renewable energy source. Furthermore, upgrading biogas to biomethane involves removing impurities to achieve a higher methane content, resulting in a premium-quality renewable natural gas suitable for injection into the existing gas grid or for use as a transportation fuel.

In addition to biogas and biomethane, green hydrogen produced from renewable sources through electrolysis holds immense potential as an energy carrier with zero carbon emissions. When combined with biogas and biomethane in a hybrid energy system, green hydrogen can offer long-term energy storage solutions, facilitate sector coupling, and support the decarbonisation of hard-to-abate sectors such as industry and transportation.

This Special Issue aims to provide a platform to share the latest developments in biogas production, biomethane upgrading, green hydrogen applications, and integrated energy systems. Both review and research articles are welcome.

Prof. Dr. João Fernando Pereira Gomes
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Gases is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • bio-energy
  • biogas
  • biomethane
  • green hydrogen

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Published Papers (1 paper)

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20 pages, 5570 KiB  
Article
Combustion Diagnosis in a Spark-Ignition Engine Fueled with Syngas at Different CO/H2 and Diluent Ratios
by Santiago Martinez-Boggio, Pedro Teixeira Lacava, Felipe Solferini de Carvalho and Pedro Curto-Risso
Gases 2024, 4(2), 97-116; https://doi.org/10.3390/gases4020006 - 15 May 2024
Viewed by 985
Abstract
The gasification of residues into syngas offers a versatile gaseous fuel that can be used to produce heat and power in various applications. However, the application of syngas in engines presents several challenges due to the changes in its composition. Such variations can [...] Read more.
The gasification of residues into syngas offers a versatile gaseous fuel that can be used to produce heat and power in various applications. However, the application of syngas in engines presents several challenges due to the changes in its composition. Such variations can significantly alter the optimal operational conditions of the engines that are fueled with syngas, resulting in combustion instability, high engine variability, and misfires. In this context, this work presents an experimental investigation conducted on a port-fuel injection spark-ignition optical research engine using three different syngas mixtures, with a particular focus on the effects of CO/H2 and diluent ratios. A comparative analysis is made against methane, considered as the baseline fuel. The in-cylinder pressure and related parameters are examined as indicators of combustion behavior. Additionally, 2D cycle-resolved digital visualization is employed to trace flame front propagation. Custom image processing techniques are applied to estimate flame speed, displacement, and morphological parameters. The engine runs at a constant speed (900 rpm) and with full throttle like stationary engine applications. The excess air–fuel ratios vary from 1.0 to 1.4 by adjusting the injection time and the spark timing according to the maximum brake torque of the baseline fuel. A thermodynamic analysis revealed notable trends in in-cylinder pressure traces, indicative of differences in combustion evolution and peak pressures among the syngas mixtures and methane. Moreover, the study quantified parameters such as the mass fraction burned, combustion stability (COVIMEP), and fuel conversion efficiency. The analysis provided insights into flame morphology, propagation speed, and distortion under varying conditions, shedding light on the influence of fuel composition and air dilution. Overall, the results contribute to advancing the understanding of syngas combustion behavior in SI engines and hold implications for optimizing engine performance and developing numerical models. Full article
(This article belongs to the Special Issue Bio-Energy: Biogas, Biomethane and Green-Hydrogen)
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